This article explains a few simple checks to carry out if you are having difficulty sending email via your email client like Outlook Express or Mozilla Thunderbird.
The exact method for doing these checks differs depending on the software used. The following instructions for are for based on Outlook Express but most clients are very similar:
In order to send e-mail securely through our mail servers, the SMTP authentication option needs to be enabled within your e-mail client software.
Click the Tools menu at the top of the window and then click Accounts.
Click the Mail tab on the resulting Internet Accounts Window, and select your 123-reg e-mail account
Click Properties to open the Properties dialogue box for your e-mail account
Under the Outgoing Mail Server heading, check the My Server requires authentication box and click OK
You may need to close down your email client and then restart it to activate any changes
Still experiencing problems?
Follow steps 1 - 3 above
Ensure the Outgoing Ports are detailed as either Port 25 or Port 587
Please note:Some Internet Service Providers (ISPs) may block Port 25, so you may need to try both options.
You may also need to contact your ISP to ask if their policy is to block use of a 3rd party SMTP server. If it is, your ISP will probably advise you to use their SMTP server and will provide you with their SMTP settings which you will need to insert instead of the above.